Remove various unused feature gates

Author: bjorn3

compiler/rustc_data_structures/src/lib.rs

@@ -7,7 +7,6 @@
 //! This API is completely unstable and subject to change.
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
-#![feature(allow_internal_unstable)]
 #![feature(array_windows)]
 #![feature(associated_type_bounds)]
 #![feature(auto_traits)]

compiler/rustc_lint/src/lib.rs

@@ -26,7 +26,6 @@
 //! This API is completely unstable and subject to change.
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
-#![cfg_attr(test, feature(test))]
 #![feature(array_windows)]
 #![feature(bool_to_option)]
 #![feature(box_patterns)]

compiler/rustc_middle/src/lib.rs

@@ -41,13 +41,11 @@
 #![feature(once_cell)]
 #![feature(min_specialization)]
 #![feature(trusted_len)]
-#![feature(test)]
 #![feature(in_band_lifetimes)]
 #![feature(crate_visibility_modifier)]
 #![feature(associated_type_bounds)]
 #![feature(rustc_attrs)]
 #![feature(half_open_range_patterns)]
-#![feature(exclusive_range_pattern)]
 #![feature(control_flow_enum)]
 #![feature(associated_type_defaults)]
 #![feature(iter_zip)]

compiler/rustc_target/src/lib.rs

@@ -15,7 +15,6 @@
 #![feature(exhaustive_patterns)]
 #![feature(min_specialization)]
 #![feature(step_trait)]
-#![feature(unchecked_math)]
 
 use std::path::{Path, PathBuf};
 

compiler/rustc_ty_utils/src/lib.rs

@@ -6,8 +6,6 @@
 
 #![doc(html_root_url = "https://doc.rust-lang.org/nightly/nightly-rustc/")]
 #![feature(control_flow_enum)]
-#![feature(half_open_range_patterns)]
-#![feature(exclusive_range_pattern)]
 #![feature(nll)]
 #![recursion_limit = "256"]